Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	$ 258,045	$ 244,732
Tax (benefit) expense	11,996	10,142
Total reclassifications for the period, net of tax	(17,723)	(15,097)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	5,075	4,700
Tax (benefit) expense	(1,974)	(1,828)
Total reclassifications for the period, net of tax	3,101	2,872
Actuarial Losses Recognized | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	5,525	5,150
Tax (benefit) expense	(2,149)	(2,003)
Total reclassifications for the period, net of tax	3,376	3,147
Prior Service Costs Recognized | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	(450)	(450)
Tax (benefit) expense	175	175
Total reclassifications for the period, net of tax	$ (275)	$ (275)